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There are a total of 21 Interstate Highways in Ohio, including both primary and auxiliary routes. All of the Interstates are owned and maintained by the state of Ohio; however, they were all built with money from the U.S. federal government. The road miles of these 21 Interstates add up to a total of . Ohio has more route miles than this, most of which comes from Interstate 80 being concurrent with Interstate 90 for . The Interstate Highways in Ohio range in length from Interstate 71, at , all the way down to Interstate 471, at .〔 As of 2006, out of all the states, Ohio has the fourth-largest Interstate Highway System. Ohio also has the fifth-largest traffic volume and the third-largest quantity of truck traffic. Ohio ranks second in the nation in terms of the number of bridges for its Interstate Highway System. On June 29, 1956, President Dwight D. Eisenhower signed the Federal Aid Highway Act, which called for the construction of up to of Interstate Highways. Of that, up to were to be built in Ohio. The same year, Ohio passed a law which raised the state's speed limit to , and in 1957, Ohio began the construction of its Interstate Highway allotment. By 1958, Ohio had spent more money on its Interstate Highways than either New York or California. In 1960, Ohio had completed the construction of of pavement; in 1962, Ohio had completed the construction of of pavement; and in 1970, Ohio had completed the construction of of pavement. By the end of 1971, Ohio had only of interstate still to build. On September 19, 2003, Ohio finally finished the originally planned Interstate Highway System.〔 == Primary highway list == File:I-71 I-70 Columbus OH (crop).jpg|I-70 at the I-71 interchange near Columbus File:Overview of West Lancaster.jpg|I-71 near West Lancaster and Octa File:Lockland Ohio Canal.jpg|I-75 near the Lockland Miami and Erie Canal File:Brimfield Township, Portage County, Ohio.jpg|I-76 in Portage County File:I80Cuyahoga.JPG|I-80 over the Cuyahoga River 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Interstate Highways in Ohio」の詳細全文を読む スポンサード リンク
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